@Shari Roluthon

Add "Delete" Button to Each Entry:
For each entry in the list, add a "delete" or "remove" button that users can click to remove that specific item. You can use HTML and JavaScript (or jQuery) to achieve this functionality.

For example, your widget template could look something like this:

Add JavaScript for Removing Entries:
Write JavaScript (or jQuery) to handle the removal of entries when users click the "delete" or "remove" button. You'll need to target the button click event and remove the corresponding entry from the list.
$(document).ready(function() {
$(".remove-entry").on("click", function() {
$(this).closest(".multiple-entry").remove();
});
});

Handle Empty Entries on Submission:
When handling form submissions on the server-side, you'll need to account for empty entries and remove them before saving the data to separate columns in the database.

For example, in your form submission handler:
$field_1_values = $form_state->getValue('field_1');
$field_2_values = $form_state->getValue('field_2');
$field_3_values = $form_state->getValue('field_3');

// Remove empty entries before saving to database.
$entries = [];
foreach ($field_1_values as $key => $value) {
if (!empty($value)) {
$entries[] = [
'field_1' => $value,
'field_2' => $field_2_values[$key],
'field_3' => $field_3_values[$key],
];
}
}

// Save $entries to separate columns in the database.
// ...

creating a new IgnoreDestinationRedirectResponse class and modifying the RedirectResponseSubscriber accordingly.
1. Create the IgnoreDestinationRedirectResponse Class:
Create a new class that extends the Symfony\Component\HttpFoundation\RedirectResponse class. This class will allow you to ignore the ?destination parameter in certain cases.

2. Implement the FormStateInterface Helpers:
In Drupal, you can use FormStateInterface to handle form-related functionality. Add the following methods to the FormStateInterface:
<?php
use Drupal\Core\Form\FormStateInterface;

interface FormStateInterface extends \ArrayAccess {

// ...

/**
* Gets the status of whether to ignore the ?destination query parameter in redirects.
*
* @return bool
* TRUE to ignore ?destination, FALSE otherwise.
*/
public function getIgnoreDestination();

/**
* Sets the status of whether to ignore the ?destination query parameter in redirects.
*
* @param bool $status
* TRUE to ignore ?destination, FALSE otherwise.
*
* @return $this
*/
public function ignoreDestination($status);
}

3. Implement RedirectResponseSubscriber:
Modify the RedirectResponseSubscriber to check if the redirect should ignore the ?destination parameter based on the IgnoreDestinationRedirectResponse and FormStateInterface settings.

4. Use the New Helpers in Forms:
Now you can use the new FormStateInterface methods in your forms to control whether the redirect should ignore the ?destination parameter or not. For example:
<?php
use Drupal\Core\Form\FormStateInterface;

public function submitForm(array &$form, FormStateInterface $form_state) {
// Your form submission logic here.

// Use the ignoreDestination() method to set whether to ignore ?destination or not.
$form_state->ignoreDestination(TRUE);

// Redirect to a specific page without considering ?destination.
$form_state->setRedirect('your.route.name');
}